I've noticed with the colder weather or maybe just recently that the RPM's on my stock 2002 WRX jump up a few hundred (300-500) when shifting gears. Is this normal or a sign that something is wearing out? Is there a name for it?
I'm assuming you mean upshifting if it's a manual, it's just you.....things might be wearing down, or the clutch is slipping more in the cold and your not letting off the gas entirely before pushing in the clutch....something along those lines if it's an auto, unfortunately, it sounds to me like a failing Torque Converter....I hope someone will correct me if I'm wrong, however......
chux is pretty much dead on, accept for the torque converter part, its not out of the question, but it would more likely be the clutch bands inside the tranny slipping...but it sounds more like your car is a manual, and your clutch is on its way out it may last longer if you drive it gently
I think you both need to check your facts on WRX/STI. The jump in revs is due to the Idle Air Controler and the ECU. Or in the STI the the drive by wire and the ecu. There is aditional air introduced into the motor on overrun as well as the injectors are shut off to allow for low emissions. As for a bad clutch in a 5-6mt, you would first see something like cruising down the freeway at 55MPH then giving 100% throttle. The revs would go up fast and the car would not increase speed at the same rate. Kosh your car is fine.
he said while he was shifting though, the higher the clutch engagment (from a clutch getting some miles on it) the more rpm its gonna jump if hes not used to it. he has a 2002 wrx
Yes, I can read 1) The WRX is a hydrolic clutch with an anti drop valve as well as a anti shutter valve. Those with WRX/STI do not get the same engagement of the clutch twice. You might want to get some seat time in a WRX as the clutch is completely different from a L. Maybe the observiant WRX/STI owners could give you some feedback on this. 2) When you let off the gas either to shift or coast, the injectors shut off and the IAC opens to supply the motor with more air than is needed to reduce emissions.
My WRX is a 5spd. I don't think the clutch is going. It grabs very hard and only has about 30k-35k on it (shudder recall done around 20k). I've driven manuals all my life (18 years of driving).
ust be thankful you dont have an evo 9 where the IAC dumps way more than the WRX/STI. Its hardly noticeable on a wrx compared to the evo. and matt is right, a failing clutch will always be detectable by flooring it in 5th gear. My RS acted just like that when the clutch went.
i didnt say you werent right, but now that you have explained everything i can see exactly where you are coming from, and i have driven WRXs and STIs, ive logged at least a few thousand in each, working at a subaru dealer for the past 5 yrs its easy to do. I dont feel a huge difference between my L clutch and a wrx clutch...mainly because thats what i have in my L, a wrx clutch! anyway i didnt mean any disrespect
Thanks Matt! Kosh, your car is fine. Mine does the same thing....but it's more driver error than anything else. Your not letting of the gas soon enough, or the grease in your throttle cable is thicker because of temp, so your throttle isn't letting off as fast as you want it to...causing your rpm to jump a few hundred when you shift.
this is interesting however. I've been driving manuals since i first started driving. I consider myself to be decent at it. I've never had this problem on any other car but now i occasionally have it. i was thinking it was driver error, which most likely it is. but i wonder if there is a different underlying problem here that we dont know about.
I would tend to agree as my 03 WRX does it sometimes too.... its almost like the the throttle sticks for a second or so then I change gears... maybe its me just screwing up my change timing but I havent seen any issues from it other than annoying me...
It is very obvious in the STi...even though I knew it was due to the DBW/ECU, I was always trying to adjust my shifting when I first got the car. I have grown to really like the extra blip the ECU gives it during shifts.
my RPM boost before i feel the car accelerate, it happens in 4th and 5th gear, it will boost from 4-6 RPM before i can feel it, could this be my clutch slipping as well ? never did this before, if i need to repalce my clutch, whats a good one and how hard is it to replace ? any help would be greatfull. Thanks
Tell me what is wrong with my thinking of the engine blip, because I thought it was something different.... The rev comes from the turbo building pressure in the intercooler and piping so that it is pressurized. When you let off the gas between shifts, the air in the intercooler and what not, gets let out through the BOV, but doesn't make it out of the system. The computer in turn has to react to this and give some more gas to burn up this excess air. That blip in the throttle is coming from the car using up that excess pressurized air in the system between shifts. Does anybody have this problem with a N/A car?
Best way to check your clutch slipping is put it in 5th gear around 50 mph and floor it. If the revs go up but the engine accelerates at a much slower rate than usual your clutch is on its way out.
I had something stick once on my WRX, I ended up resetting the computer (pulled the battery cable off) and it stopped after that, once did it once. The rpm's would jump up when I push the clutch in.
same with my car. its an 03 wrx and when i shift near redline she jumps a little more with the clutch in. I also have a lightened flywheel so i didnt know if that was the issue or what but i never thought anything was wrong. but thanks for the good info
